Railroads may raise rates by a percentage
increase in the railroad cost index that the ICC determines; the railroads could
raise rates by 6 percent per year through 1984 and 4 percent thereafter.
zone of rate
Motor carriers may raise or lower rates by 10 percent in one year without
ICC interference; if the rate change is within the zone of freedom, the rate is
presumed to be reasonable.
A zone or limit within which air carriers may change rates
without regulatory scrutiny; if the rate change is within the zone, the new rate
is presumed to be reasonable.
The constant price of a product at all geographic locations within a